@article{DAN_1992_325_4_a4,
     author = {E. V. Radkevich and B. O. \`Eshonkulov},
     title = {On the existence of the classical solution of the problem of},
     journal = {Doklady Akademii Nauk},
     pages = {668--673},
     publisher = {mathdoc},
     volume = {325},
     number = {4},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1992_325_4_a4/}
}